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采用光学显微镜、扫描电镜、透射电镜、拉伸试验、剥落腐蚀试验等分析方法,研究了不同固溶、时效处理制度对含钪7085铝合金(Al-7.5Zn-1.5Mg-1.4Cu-0.15Zr-0.15Sc)强度和剥落腐蚀性能的影响。结果表明:与常规固溶处理和双级固溶处理相比,强化固溶可使合金中粗大相溶解更充分,晶粒细化,同时提高合金强度和剥落腐蚀性能;在T6、T76、回归再时效3种时效状态下,T76时效后合金的强度和剥落腐蚀抗性最好,这与形成的粗大不连续的晶界析出相有关。含钪7085铝合金最佳固溶时效制度为:强化固溶(450℃×1 h+460℃×2 h+475℃×2 h)+T76时效(120℃×5 h+160℃×7 h)处理。
The effects of solution treatment and aging treatment on the corrosion resistance of 7085 aluminum alloy (Al-7.5Zn-1.5Mg-1.4Cu-0.15Zr) with scandium were studied by optical microscope, scanning electron microscope, transmission electron microscope, tensile test and exfoliation corrosion test. -0.15Sc) strength and exfoliation corrosion properties. The results show that, compared with the conventional solution treatment and two-stage solution treatment, strengthening solid solution can dissolve the coarse phase in the alloy more fully and grain refinement, and improve the alloy strength and exfoliation corrosion performance; at T6, T76, After re-aging for 3 kinds of aging conditions, the strength and exfoliation corrosion resistance of the alloy after T76 aging is the best, which is related to the formation of coarse and discontinuous grain boundary precipitates. The optimum solution treatment time of 7085 aluminum alloy with scandium is as follows: solid solution (450 ℃ × 1 h + 460 ℃ × 2 h + 475 ℃ × 2 h) + T76 aging (120 ℃ × 5 h + 160 ℃ × 7 h )deal with.